Do a search in this subforum, and you'll see a lot of threads and a lot of opinions. There are definitely a lot of good posts about Plantronics 510, 520, and 925, so that's a good place to start. Mixed reviews of the jawbone and the Apple, so I'd say caveat emptor there.
I have the Plantronics 510, and I highly recommend it. The only thing I don't like about it is the size, so I'll be moving to the smaller 925 in hopes that the sound quality will be the same. I've heard nothing but good, so I'm sure it will be.
HTH